https://www.dlsite.com/books/work/=/product_id/BJ062315.html
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The meal with my sister was under the kotatsu.

"How dare you interfere with my sex with her...!"
In revenge, I teased my older sister's pussy under the kotatsu, and she came out while holding back...!?

--I was supposed to be having lovey-dovey sex with my girlfriend at my house, but my sister came home and the three of us were studying together.
But I couldn't stop myself from getting horny, and when I reached for her pussy in the kotatsu, I mistakenly blamed my sister,
I had mistakenly touched my sister!
I thought she was going to get mad at me, but when I saw her embarrassed and sad face, I got really excited.
I couldn't resist her soft and tender pussy....

English Webtoon version (Complete): https://e-hentai.org/g/2440729/866a47f877/

p.10? how? stupid story idea . lol

Base +8